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Trigonometry Cosine Formulae. Sine form. Area of triangle form Pythagoras' theorem and applications to basic problems Radian measure Sine & cosine formulae Solving trigonometric equations The addition formulae The double angle formula The form R cos x minus alpha Trig functions: cosec. sec. cot Trig ratios in a right angled triangle Trigonometric identities Trigonometric ratios in all quadrants